In the initial consonant part, the local sound of 2 1 initial consonant is read correctly, and then it is memorized according to different classification standards, that is, pronunciation position and pronunciation method, and then integrated;

In the vowel part, according to the structure of vowels, it is enough to memorize 10 single vowels, 13 compound vowels and 16 nasal vowels respectively;

The tongue bitmap is just a single vowel. It is a vowel of tongue vowels, and there are only seven tongue vowels in Mandarin, so it is very convenient to remember it with a tongue bitmap.